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Note 4 - Supplemental Balance Sheet Information - Summary of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Balance	$ 37,428
Effect of foreign currency translation	(71)
Balance	37,357
Battery & Energy Products Segment [Member]
Balance	25,935
Effect of foreign currency translation	(71)
Balance	25,864
Communications Systems Segment [Member]
Balance	11,493
Effect of foreign currency translation	0
Balance	$ 11,493

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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